Viagra is the first FDA approved pill for the treatment of men who have difficulty having and maintaining an erection (impotence). The primary chemical ingredient used in Viagra is sildenafil citrate. It is a convenient, discreet pill you take only when you want to have sex. Viagra can help many men suffering from erectile dysfunction achieve and maintain erection when they are sexually aroused. So with Viagra, a touch or a glance from your partner can again lead to something more.